[react-packager] Avoid referring `Module` like objects in `BundlesLayout`

Summary:
The `BundlesLayout` will be used as a persistent index. As such, it would be easier to avoid having dependencies to `Module`, `Package`, `Asset`, etc. We're not using that information for now and if we happen to need to use it we could always fetch it using the `ModuleCache`.

react-packager/src/BundlesLayout/__tests__/BundlesLayout-test.js

@@ -61,7 +61,7 @@ describe('BundlesLayout', () => {
       return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
         expect(bundles).toEqual({
           id: 'bundle.0',
-          modules: [dep('/root/index.js'), dep('/root/a.js')],
+          modules: ['/root/index.js', '/root/a.js'],
           children: [],
         })
       );
@@ -88,10 +88,10 @@ describe('BundlesLayout', () => {
       return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
         expect(bundles).toEqual({
           id: 'bundle.0',
-          modules: [dep('/root/index.js')],
+          modules: ['/root/index.js'],
           children: [{
             id:'bundle.0.1',
-            modules: [dep('/root/a.js')],
+            modules: ['/root/a.js'],
             children: [],
           }],
         })
@@ -124,13 +124,13 @@ describe('BundlesLayout', () => {
       return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
         expect(bundles).toEqual({
           id: 'bundle.0',
-          modules: [dep('/root/index.js')],
+          modules: ['/root/index.js'],
           children: [{
             id: 'bundle.0.1',
-            modules: [dep('/root/a.js')],
+            modules: ['/root/a.js'],
               children: [{
                 id: 'bundle.0.1.2',
-                modules: [dep('/root/b.js')],
+                modules: ['/root/b.js'],
                 children: [],
               }],
           }],
@@ -164,10 +164,10 @@ describe('BundlesLayout', () => {
       return newBundlesLayout().generateLayout(['/root/index.js']).then(bundles =>
         expect(bundles).toEqual({
           id: 'bundle.0',
-          modules: [dep('/root/index.js')],
+          modules: ['/root/index.js'],
           children: [{
             id: 'bundle.0.1',
-            modules: [dep('/root/a.js'), dep('/root/b.js')],
+            modules: ['/root/a.js', '/root/b.js'],
             children: [],
           }],
         })
@@ -200,10 +200,10 @@ describe('BundlesLayout', () => {
       return newBundlesLayout().generateLayout(['/root/index.js']).then(
         bundles => expect(bundles).toEqual({
           id: 'bundle.0',
-          modules: [dep('/root/index.js'), dep('/root/a.js')],
+          modules: ['/root/index.js', '/root/a.js'],
           children: [{
             id: 'bundle.0.1',
-            modules: [dep('/root/b.js')],
+            modules: ['/root/b.js'],
             children: [],
           }],
         })

react-packager/src/BundlesLayout/__tests__/BundlesLayoutIntegration-test.js

@@ -80,28 +80,17 @@ describe('BundlesLayout', () => {
 
     function stripPolyfills(bundle) {
       return Promise
-        .all([
-          Promise.all(
-            bundle.modules.map(module => module
-              .getName()
-              .then(name => [module, name])
-            ),
-          ),
-          Promise.all(
-            bundle.children.map(childModule => stripPolyfills(childModule)),
-          ),
-        ])
-        .then(([modules, children]) => {
-          modules = modules
-            .filter(([module, name]) => { // filter polyfills
+        .all(bundle.children.map(childModule => stripPolyfills(childModule)))
+        .then(children => {
+          const modules = bundle.modules
+            .filter(moduleName => { // filter polyfills
               for (let p of polyfills) {
-                if (name.indexOf(p) !== -1) {
+                if (moduleName.indexOf(p) !== -1) {
                   return false;
                 }
               }
               return true;
-            })
-            .map(([module, name]) => module.path);
+            });
 
           return {
             id: bundle.id,

react-packager/src/BundlesLayout/index.js

@@ -58,7 +58,7 @@ class BundlesLayout {
         return promiseWhile(
           () => pendingSyncDeps.length > 0,
           () => {
-            const dependencies = _.values(syncDependencies);
+            const dependencies = Object.keys(syncDependencies);
             if (dependencies.length > 0) {
               bundle.modules = dependencies;
             }
@@ -72,7 +72,7 @@ class BundlesLayout {
                   if (dep.path !== pendingSyncDep && !dep.isPolyfill()) {
                     pendingSyncDeps.push(dep.path);
                   }
-                  syncDependencies[dep.path] = dep;
+                  syncDependencies[dep.path] = true;
                   this._moduleToBundle[dep.path] = bundle.id;
                 });
                 deps.asyncDependencies.forEach(asyncDeps => {